Name That Trauma :: Reader Ashley M. on Upchucking Aliens

Hey. I just recently remembered a book from my childhood that I was looking to put to rest. It was a picture book about these aliens who come to earth. I really have no idea why, but either all the kids or all the aliens started throwing up, and there was a full color illustration of either kids or aliens/monsters or both) puking. My mom was so upset by it that she had to talk to a librarian about it. I really want to know if anybody remembers this book (and can tell me why everybody was puking). I read it in ’96/’97.

UPDATE: NAME THAT TRAUMA SOLVED! Special thanks to commenter fragileguilt for throwing up the title HERE COME THE ALIENS!